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Post by aurelio on Mar 15, 2014 9:39:58 GMT -8
Hello mates, I have finished my rocket mass heater. I want to thank this forum and its members for their help and expertise. You can see the video how it's made. Best regards.
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Post by satamax on Mar 15, 2014 11:45:57 GMT -8
Aurelio, it'sh realy nice. But that looks like an 8 incher or so. I think you don't have enough heat extraction with just two half barrels. I think you could go up to 8 half barrels. That would be about 6 square metre of bell. What are your flue temps after the bench?
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Post by aurelio on Mar 16, 2014 5:37:39 GMT -8
Yes, it is 8 inches. You're right, I'm only a third of the surface of fricion necessary, but there was no more space available for a longer bench. I tried to compensate by bell in the first half barrel, it looks the same as the last with a hole equal. I hope my explanation is understandable in English. I have no thermometer to measure temperature in the chimney but you can keep your hand on it for a few seconds.
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Post by matthewwalker on Mar 19, 2014 8:55:42 GMT -8
Fantastic work Aurelio, what a nice heater! I've built short systems like yours and have been really happy with the performance. I think you will love it once it's all dry and warmed up. Thanks a lot for sharing the video.
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Post by canyon on Mar 19, 2014 9:12:02 GMT -8
Nice Work! You did a great job on your video too! I just wanted to bring up for those checking this out how the mass backrest in this build will not be very warm (in my experience) and if it is lower temp than a person leaning on it that body will be heating it (in other words it will feel cold!). What is your experience aurelio?
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Post by grizbach on Mar 19, 2014 10:03:42 GMT -8
Canyon, you are correct about the backrest. I hate to point it out after the fact but if the drums were placed rounded side down it would have more heat extraction. A good tip to know for limited space.
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Post by 2tranceform on Mar 19, 2014 11:40:28 GMT -8
Canyon, you are correct about the backrest. I hate to point it out after the fact but if the drums were placed rounded side down it would have more heat extraction. A good tip to know for limited space. Grizbach, could you please expand on the rounded side down statement?
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Post by aurelio on Mar 19, 2014 14:10:26 GMT -8
Sorry I can not give details of operation, the bench is not dry yet. It just only worked for 4 hours. Only the portion of the seat closest to the collector are heated and the rest of seat feel cold still, heat did not get to the back rest. I promise to give more details, when it's dried.
Canyon, do you use in your buildings completely cut half barrels ? or bell form?
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Post by grizbach on Mar 19, 2014 18:47:27 GMT -8
trance, The floor of each barrel's position wouldn't get as much heat as the ceiling. With the flat side of the barrel up, you have more surface area contacting the hotter of the gasses. You would also have a more even heat on your bum with the flat side up because there would be a consistant mass between the gases and the seat.
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Post by canyon on Mar 19, 2014 21:54:49 GMT -8
Canyon, do you use in your buildings completely cut half barrels ? or bell form? Half barrels are a sweet trick for bells (ripped or crosscut) , we use them or any other "lid" like old sinks or what have you in the boneyards around that fit the needs although we try not to do big spans with "blood lath" anymore. Many of the benches up here are needed for more storage than lower latitudes so we've mostly been doing bells at either or both ends of a down and back flue pipe run surrounded by 6 to 10 inches of mass.
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Post by aurelio on Apr 17, 2014 8:55:26 GMT -8
The stove is dry. I've done a little test of three hours working. 11 kilos of firewood, mixed hardwood and softwood were burned. ¿11 kg / 3 h it is correct? It was not enough to heat the whole work. The back remained cold, the seat is heated well in the start smoke route, perhaps too, perhaps with a longer burning becomes uncomfortable, what temperature is right? Moderately heated in half and only slightly into the end of travel of the smoke. After six hours the temperatures remained well off, touch sensation, and 24 hours later still feeling heat felt, especially in the area close to the manifold and body mud stove. Sorry I can not provide more accurate and comprehensive data. I think even the cold season arrives we shall not use it. In the Mediterranea area the heat just came here I will update the data in the future
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